CN105044433B - A kind of anti-interference adjustable giant magnetoresistance effect current sensor - Google Patents
A kind of anti-interference adjustable giant magnetoresistance effect current sensor Download PDFInfo
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- CN105044433B CN105044433B CN201510393733.0A CN201510393733A CN105044433B CN 105044433 B CN105044433 B CN 105044433B CN 201510393733 A CN201510393733 A CN 201510393733A CN 105044433 B CN105044433 B CN 105044433B
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Abstract
The present invention relates to a kind of anti-interference adjustable giant magnetoresistance effect current sensor, permanent magnet, micrometer caliper, insulation barrier, shell and the signal processing circuit being be arranged in parallel including giant magnetoresistance effect chip, with giant magnetoresistance effect chip, signal processing circuit are connected with giant magnetoresistance effect chip；Giant magnetoresistance effect chip and permanent magnet are fixedly installed in shell vertically, the measuring staff front end of micrometer caliper vertically penetrates shell, the measuring staff front end of the micrometer caliper is vertically and fixedly provided with insulation barrier, insulation barrier is be arranged in parallel with giant magnetoresistance effect chip, and the giant magnetoresistance effect chip is placed between insulation barrier and permanent magnet；The outer wall of electrified wire to be measured crimps with insulation barrier, and crimping point is the micrometer caliper and the tie point of insulation barrier.The present invention by setting micrometer caliper on giant magnetoresistance effect current sensor, can flexible modulation and measurement the distance between giant magnetoresistance effect chip and electrified wire to be measured, raising current sensor measurement result the degree of accuracy.
Description
Technical field
The present invention relates to power system measuring technical field, and in particular to a kind of anti-interference adjustable giant magnetoresistance effect electricity of clip
Flow sensor.
Background technology
With the continuous development of Power Electronic Technique, people also get over to the reliability of current sensor, the requirement of convenience
Come higher.Traditional electromagnetic current transducer is to be based on coil principle, and electric current, this kind of coil are measured by the sensing of coil
Winding type current transformer volume is big, frequency band is narrow, metals resources consumption is big, insulating requirements are high, and can only measure alternating current, right
It can not be measured in signals such as direct current, transient state and higher hamonic waves, large-scale distributed monitoring can not be applied to.Current light
Fine the complicated of formula current sensor, cost are high, it is difficult to are applied in large-scale commercial applications.Though Hall-type current sensor
More application is so obtained in power network, but the measurement of Hall effect element power consumption is high, resistance to pressure is not high, overall performance is easy
Influenceed by temperature and technique, sensitivity is very low, can not apply in terms of high-precision current measurement.
Giant magnetoresistance effect current sensor has high sensitivity, high workload bandwidth range, temperature stability to applying magnetic field
Splendid, high pressure resistant, low-power consumption and miniaturization the features such as and as research field of current measurement focus.However, giant magnetoresistance effect
Sensitivity of the current sensor to magnetic field is very high so that they are highly susceptible to the interference in extraneous mixed and disorderly magnetic field, and external magnetic field is done
Disturb and be easy to make sensor produce larger output error, influence the degree of accuracy of measurement result.The field source bag in these mixed and disorderly magnetic fields
Include current－carrying conductor around the electric equipments, or sensor such as motor and transformer etc..Meanwhile because magnetic caused by electrified wire
Field size and the distance of effect chip to conductor are inversely proportional so that the distance of giant magnetoresistance effect chip to residing conductor has to magnetic field
Very big influence.
Existing giant magnetoresistance effect sensor manufacturing process is complicated, temperature drift phenomenon is serious, can cause certain output error,
And circuit structure is complicated.The electric current of existing detection integrated circuit ampere wires is accessed in integrated circuit, it is necessary to which electric current will be measured,
Limit measurement electric current size, and in integrated current sensors two ampere wires distance it is close, kindred effect can be produced,
Interference is very big.Meanwhile the distance of existing giant magnetoresistance effect chip and conductor can not flexibly change, it has not been convenient to measure.
The content of the invention
The technical problems to be solved by the invention are that existing giant magnetoresistance effect current sensor can not be adjusted flexibly and measure
The distance between giant magnetoresistance effect chip and electrified wire to be measured.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of anti-interference adjustable giant magnetoresistance effect current sense
Device, including it is giant magnetoresistance effect chip, the permanent magnet be arrangeding in parallel with giant magnetoresistance effect chip, micrometer caliper, insulation barrier, outer
Shell and signal processing circuit, the signal processing circuit are connected with giant magnetoresistance effect chip；
The giant magnetoresistance effect chip and permanent magnet are fixedly installed in shell vertically；
The micrometer caliper includes measuring staff and sleeve, and the measuring staff is socketed in sleeve, and the measuring staff rotates with sleeve
Connection, the sleeve penetrate shell and are fixedly connected with shell, the distance between the barrel forward end and permanent magnet and giant magnetoresistance
Effect chip is equal with the distance between permanent magnet；The measuring staff front end is placed in shell, and the measuring staff front end is vertically and fixedly provided with
Insulation barrier, the insulation barrier be arranged in parallel with giant magnetoresistance effect chip, and the giant magnetoresistance effect chip is placed in insulation barrier
Between permanent magnet, the giant magnetoresistance effect chip and permanent magnet are located at the side of measuring staff；Electrified wire to be measured is connected to shell
It is interior, and the outer wall of electrified wire to be measured crimps with insulation barrier, crimping point is the connection of the micrometer caliper and insulation barrier
Point.
The beneficial effects of the invention are as follows：The present invention by setting micrometer caliper on giant magnetoresistance effect current sensor,
Can flexible modulation and measurement the distance between giant magnetoresistance effect chip and electrified wire to be measured, raising current sensor measurement result
The degree of accuracy.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, the shell is clip-like magnetic screen shell 1, including folder and lower folder in shape and structure identical, the upper folder
Set with lower folder in specular, the upper folder includes first connecting portion and the first Access Division, and the lower folder includes the second connection
Portion and the second Access Division, the giant magnetoresistance effect chip and permanent magnet are fixedly installed on the interior of first connecting portion or second connecting portion
On wall；Connected between the first connecting portion and second connecting portion by torsion spring, first Access Division and the second Access Division lead to
Cross torsion spring and drive the folding for realizing folder and lower folder；The sleeve of the micrometer caliper is from first connecting portion and the first Access Division
Transition position passes through or the transition position from second connecting portion and the second Access Division passes through.
It is using the above-mentioned further beneficial effect of scheme：In further scheme of the invention, by the outer of current sensor
Shell is arranged to clip-like magnetic screen shell so that current sensor completely cuts off external interference, clip-like structure by the magnetic masking layer on clip
Setting current sensor can also be directly sandwiched on different size of electrified wire and measures, it is convenient and practical.
Further, the section of first Access Division and the second Access Division is triangular in shape, first Access Division and
Two Access Divisions include plastic casing layer, the alloy magnetic masking layer that section is in horizontal positioned " 7 " font from outside to inner side successively
And high-voltage insulation layer, it is triangular in shape that section is fixedly connected with the inside of the high-voltage insulation layer of first Access Division and the second Access Division
Elastic connecting contact layer.
It is using the above-mentioned further beneficial effect of scheme：By the first Access Division and the second clamping that set triangle
Portion, after two joint ends closure, space that centre is formed is used for clamping electrified wire, and set in the internal layer of two joint ends and
Joint end shape identical elastic connecting contact layer, can effectively clamp electrified wire.
Further, two elastic connecting contact layer on the inside of first Access Division and the second Access Division are led with energization to be measured
The face of the contact of line is inner concave.
It is using the above-mentioned further beneficial effect of scheme：By by the contact surface of elastic connecting contact layer and electrified wire to be measured
It is arranged to inner concave, certain cushion space is provided for the wire of different thicknesses, avoids clamping tension.
Further, the inner concave includes the first contact surface and the second contact surface, described when not clamping electrified wire to be measured
Angle between first contact surface and the second contact surface is 100 ° -130 °.
Further, the inner concave is inner concave arc surface.
It is using the above-mentioned further beneficial effect of scheme：By the way that inner concave is arranged into globoidal structure, it is convenient with it is to be measured
The fitting of electrified wire outer wall.
Further, the distance between the permanent magnet and giant magnetoresistance effect chip are 2mm-5mm；The giant magnetoresistance effect core
The distance between piece and insulation barrier are 5mm-5cm.
It is using the above-mentioned further beneficial effect of scheme：Permanent magnet is placed on apart from the suitable position of giant magnetoresistance chip
Put, stable bias magnetic field is provided to giant magnetoresistance chip.
Further, the material of the plastic casing layer is acrylonitrile-butadiene-styrene copolymer, the alloy magnetic cup
The material for covering layer is permalloy, and the material of the high-voltage insulation layer is D602-1 epoxy imines glass mica paper tapes, the bullet
The material of property contact layer is EP rubbers.
Using having the beneficial effect that for above-mentioned further scheme：By in the exhausted of one layer of solidification of clip-like magnetic screen shell outer layer setting
Edge plastics, contact of the people with alloy magnetic masking layer can be avoided, exempt harm of the electrostatic to human body；By in clip-like magnetic screen shell
The insulating materials of one layer of D602-1 epoxy imines glass mica paper tape structure of inside increase, can effectively prevent from measuring high-tension bus-bar
When, there is the danger punctured；By placing substantial amounts of super-elasticity elastomeric material inside clip-like magnetic screen shell, can be led to be measured
Line is fixed on the middle part of the current probe so that the energization that the giant magnetoresistance current sensor can adapt to different-diameter simultaneously is led
Line, EP rubbers can also effectively prevent wire to be measured from shaking, and avoid wire to be measured caused by shake and giant magnetoresistance effect chip
Between distance change, prevent measurement error.
Further, the signal processing circuit includes giant magnetoresistance effect chip power supply voltage conversion circuit, instrument amplification electricity
Road and voltage follower circuit, the output voltage of the giant magnetoresistance effect chip power supply voltage conversion circuit are connected to giant magnetoresistance effect
The power pins of chip, the magnifier in-phase input end and inverting input respectively with giant magnetoresistance effect chip just
Output end is connected with negative output terminal；The output end of the magnifier is connected with voltage follower circuit, the voltage follow
Circuit is connected with oscillograph.
Further, the giant magnetoresistance effect chip internal is wheatstone bridge configuration.
Brief description of the drawings
Fig. 1 is the cross section structure schematic diagram of the anti-interference adjustable giant magnetoresistance effect current sensor of the present embodiment；
Fig. 2 is the cross section structure schematic diagram that the current sensor after electrified wire to be measured is removed in Fig. 1；
Fig. 3 is the dimensional structure diagram of the anti-interference adjustable giant magnetoresistance effect current sensor of the present embodiment；
Fig. 4 is Fig. 1 perspective structure perspective diagram；
Fig. 5 is the side structure schematic view of the present embodiment torsion spring；
In accompanying drawing, the list of parts representated by each label is as follows：
1st, clip-like magnetic screen shell；11st, upper folder；111st, first connecting portion；112nd, the first Access Division；1121st, plastic casing layer；
1122nd, alloy magnetic masking layer；1123rd, high-voltage insulation layer；1124th, elastic connecting contact layer；113rd, inner concave；1131st, the first contact surface；
1132nd, the second contact surface；12nd, lower folder；121st, second connecting portion；122nd, the second Access Division；2nd, electrified wire to be measured；3rd, insulation stop
Plate；4th, giant magnetoresistance effect chip；5th, permanent magnet；6th, micrometer caliper；61st, measuring staff；62nd, sleeve；7th, torsion spring；A, instrument is amplified
Device；AMP, operational amplifier；R, voltage follow resistance；D, the distance between insulation barrier and giant magnetoresistance effect chip.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1-Figure 3, a kind of anti-interference adjustable giant magnetoresistance effect current sensor of the present embodiment, including giant magnetoresistance
Effect chip 4, permanent magnet 5, micrometer caliper 6, insulation barrier 3, shell and the signal being be arranged in parallel with giant magnetoresistance effect chip 4
Process circuit, signal processing circuit are connected with giant magnetoresistance effect chip 4, and signal processing circuit includes giant magnetoresistance effect chip power supply
Voltage conversion circuit, magnifier and voltage follower circuit, the output of giant magnetoresistance effect chip power supply voltage conversion circuit
Voltage is connected to the power pins of giant magnetoresistance effect chip, magnifier in-phase input end and inverting input respectively with it is huge
The positive output end of magnetoresistance chip is connected with negative output terminal；The output end of magnifier is connected with voltage follower circuit,
Voltage follower circuit is connected with oscillograph.Giant magnetoresistance effect chip is the giant magnetoresistance effect chip of multi-layer film structure, and giant magnetoresistance is imitated
It is wheatstone bridge configuration to answer chip internal.
As shown in Figure 1-Figure 3, the shell of the present embodiment is clip-like magnetic screen shell 1, and insulation barrier 3 is plastic dam；Huge magnetic
Inhibition effect chip 4 and permanent magnet 5 are fixedly installed in shell vertically；Micrometer caliper includes measuring staff 61 and sleeve 62, measuring staff 61
It is socketed in sleeve 62, sleeve 62 penetrates shell and connection fixed thereto.As shown in figure 4, between the front end of sleeve 62 and permanent magnet 5
Distance and giant magnetoresistance effect chip 4 it is equal with the distance between permanent magnet 5；Measuring staff outer wall is provided with external screw thread, and sleeve lining is set
There is corresponding internal thread, measuring staff and sleeve are spun by screw thread；The front end of measuring staff 61 of micrometer caliper 6 is placed in shell,
The front end of measuring staff 61 of micrometer caliper 6 is vertically and fixedly provided with insulation barrier 3, and insulation barrier 3 is parallel with giant magnetoresistance effect chip 4 to be set
Put, giant magnetoresistance effect chip 4 is placed between insulation barrier 3 and permanent magnet 5, between permanent magnet 5 and giant magnetoresistance effect chip 4 away from
From for 2mm-5mm；The distance between giant magnetoresistance effect chip 4 and insulation barrier 3 are 5mm-5cm；Electrified wire 2 to be measured can clamping
In shell, and the outer wall of electrified wire to be measured 2 crimps with insulation barrier 3, and crimping point is the micrometer caliper and insulation stop
The sensitive direction of principal axis of the tie point of plate, i.e. giant magnetoresistance effect chip is with the flow direction in electrified wire magnet ring in same straight line
On., can flexible modulation and measurement giant magnetoresistance effect chip by setting micrometer caliper on giant magnetoresistance effect current sensor
The distance between electrified wire to be measured, improve the degree of accuracy of current sensor measurement result.
As shown in Figure 1-Figure 3, the clip-like magnetic screen shell of the present embodiment includes folder 11 and lower folder 12 in shape and structure identical,
Upper folder 11 and lower folder 12 are set in specular, and upper folder 11 includes the Access Division 112 of first connecting portion 111 and first, the lower bag of folder 12
The Access Division 122 of second connecting portion 121 and second is included, giant magnetoresistance effect chip 4 and permanent magnet 5 are fixedly installed on first connecting portion
111 or second connecting portion 121 inwall on, giant magnetoresistance effect chip 4 and permanent magnet 5 may be provided at the measuring staff 61 of micrometer caliper 6
Left side or right side (as shown in Figure 4)；Connected between first connecting portion 111 and second connecting portion 121 by torsion spring 7, torsion spring
Structure realizes opening for folder 11 and lower folder 12 as shown in figure 5, the first Access Division 112 and the second Access Division 122 are driven by torsion spring 7
Close；The barrel forward end of micrometer caliper 6 is passed through from the transition position of the Access Division 112 of first connecting portion 111 and first or connected from second
The transition position of the Access Division 122 of socket part 121 and second passes through, and rotationally connected；The measuring staff of micrometer caliper rotates one week, surveys
Bar moves forward 0.5mm, when barrel forward end and insulation barrier close up, zero point weight that the zero point of movable mark should just with fixed scale
Close, the distance between barrel forward end and permanent magnet and giant magnetoresistance effect chip are equal with the distance between permanent magnet, measuring staff front end
Insulation barrier move forward, you can measurement the distance between insulation barrier and barrel forward end, the distance as giant magnetoresistance effect
The distance between chip and electrified wire to be measured.The shell of current sensor is arranged to clip-like magnetic screen shell by the present embodiment, is made
Obtain current sensor and external interference is completely cut off by the magnetic masking layer on clip, the setting of clip-like structure can also be by current sensor
It is directly sandwiched on different size of electrified wire and measures, it is convenient and practical.
As shown in figure 1, in the present embodiment, the first Access Division 112 and the section of the second Access Division 122 are triangular in shape, the first card
The Access Division 122 of socket part 112 and second includes the plastic casing that cross section is in horizontal positioned " 7 " font from outside to inner side successively
Layer 1121, alloy magnetic masking layer 1122 and high-voltage insulation layer 1123, the inner side of high-voltage insulation layer 1123 are fixedly connected with cross section and are in
The elastic connecting contact layer 1124 of triangle.The material of plastic casing layer 1121 is acrylonitrile-butadiene-styrene copolymer, alloy
The material of magnetic masking layer 1122 is permalloy, and the material of high-voltage insulation layer 1123 is D602-1 epoxy imines glass mica powders
Band, the material of elastic connecting contact layer 1124 is EP rubbers.By setting the first Access Division and the second Access Division of triangle, two
After joint end closure, the space that centre is formed is used for clamping electrified wire, and the internal layer setting in two joint ends and joint end
Shape identical elastic connecting contact layer, can effectively clamp electrified wire.By setting one layer admittedly in clip-like magnetic screen shell outer layer
The ambroin of change, contact of the people with alloy magnetic masking layer can be avoided, exempt harm of the electrostatic to human body；By in clip-like magnetic
The insulating materials of one layer of D602-1 epoxy imines glass mica paper tape structure of increase inside shielding case, can effectively prevent that measurement is high
During piezoelectric wire, there is the danger punctured；By placing substantial amounts of super-elasticity elastomeric material inside clip-like magnetic screen shell, can incite somebody to action
Wire to be measured is fixed on the middle part of the current probe so that the giant magnetoresistance current sensor can adapt to different-diameter simultaneously
Electrified wire, EP rubbers can also effectively prevent wire to be measured from shaking, and avoid wire to be measured caused by shake from being imitated with giant magnetoresistance
The change of distance between chip is answered, prevents measurement error.
As shown in Figure 1-Figure 3, the elastic connecting contact layer in the present embodiment and the contact surface of electrified wire to be measured are inner concave.It is logical
Cross and the contact surface of elastic connecting contact layer and electrified wire to be measured be arranged to inner concave, for different thicknesses wire provide it is certain
Cushion space, avoid clamping tension.
Inner concave preferred scheme one：As shown in Figures 2 and 3, above-mentioned inner concave 113 includes the first contact surface 1131 and second
Contact surface 1132, when not clamping electrified wire to be measured, the angle between the first contact surface 1131 and the second contact surface 1132 is
100°-130°。
Inner concave preferred scheme two：As shown in figure 1, above-mentioned inner concave 113 is inner concave arc surface.By the way that inner concave is arranged to
Globoidal structure, convenience are bonded with electrified wire outer wall to be measured.
The present invention efforts process be：The anti-interference adjustable giant magnetoresistance effect current sensor of clip of the present invention, bag
Include giant magnetoresistance effect chip, permanent magnet, micrometer caliper, insulation barrier, clip magnetic screen shell, the instrument amplification of multi-layer film structure
Device A, operational amplifier A MP, voltage follow resistance R, the giant magnetoresistance effect chip of multi-layer film structure is arranged on energization to be measured and led
The side of line, the sensitive direction of principal axis of giant magnetoresistance effect chip is with the flow direction in electrified wire magnet ring on same straight line.
Giant magnetoresistance current sensor folder is opened, electrified wire to be measured is clamped, the super-elasticity rubber on clip madial wall shrinks extruding
Electrified wire, electrified wire is fixed；As shown in figure 1, the positive output end and negative output of the giant magnetoresistance chip of multi-layer film structure
End is connected with instrumentation amplifier A in-phase input end and reverse input end respectively, instrumentation amplifier A output end and operation amplifier
Device AMP in-phase input end connection, voltage follow resistance R are connected in parallel on operational amplifier A MP reverse input end and output end, transported
The output end for calculating amplifier AMP directly connects oscillograph.When the electric current of electrified wire is smaller, giant magnetoresistance effect chip may not
Accurately measure the size in magnetic field, and magnetic field caused by electrified wire and the distance between electrified wire and giant magnetoresistance effect chip
D is inversely proportional, at this time, it may be necessary to which rotating screw mircrometer gauge measures and adjusted the distance between insulation barrier and giant magnetoresistance effect chip
D, giant magnetoresistance effect chip is set to be in a sizeable magnetic field.The inside of giant magnetoresistance effect chip is Wheatstone bridge knot
Structure, when constant pressure electricity is by the giant magnetoresistance effect chip, output voltage signal and magnetic field caused by tested electric current are linear.Figure
In 1, permanent magnet is placed on the suitable position of giant magnetoresistance effect chip, the inclined of stabilization is provided to giant magnetoresistance effect chip
Magnetic field is put, giant magnetoresistance effect chip passes through the magnetic field size at measurement distance electrified wire d, output voltage signal, by instrument
Amplifier A, voltage follower AMP, voltage follow resistance R carry out signal amplification conversion, and output voltage signal can direct oscillography
Device checks the real-time waveform of electric current, the current signal of display and the current in proportion relation in tested electrified wire.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (10)
- A kind of 1. anti-interference adjustable giant magnetoresistance effect current sensor, it is characterised in that including giant magnetoresistance effect chip (4), with Permanent magnet (5), micrometer caliper (6), insulation barrier (3), shell and the signal transacting that giant magnetoresistance effect chip (4) be arranged in parallel Circuit, the signal processing circuit are connected with giant magnetoresistance effect chip (4)；The giant magnetoresistance effect chip (4) and permanent magnet (5) are fixedly installed on outer casing inner wall vertically；The micrometer caliper includes measuring staff (61) and sleeve (62), and the measuring staff (61) is socketed in sleeve (62), the survey Bar (61) is rotatablely connected with sleeve (62), and the sleeve (62) penetrates shell and is fixedly connected with shell, before the sleeve (62) Hold the distance between permanent magnet (5) and giant magnetoresistance effect chip (4) equal with the distance between permanent magnet (5)；The measuring staff (61) front end is placed in shell, and measuring staff (61) front end is vertically and fixedly provided with insulation barrier (3), the insulation barrier (3) with it is huge Magnetoresistance chip (4) is be arranged in parallel, and the giant magnetoresistance effect chip (4) is placed between insulation barrier (3) and permanent magnet (5), The giant magnetoresistance effect chip (4) and permanent magnet (5) are located at the side of measuring staff (61)；Electrified wire (2) to be measured is connected to shell It is interior, and the outer wall of electrified wire to be measured (2) crimps with insulation barrier (3), crimping point is the micrometer caliper (6) and insulation stop The tie point of plate (3).
- A kind of 2. anti-interference adjustable giant magnetoresistance effect current sensor according to claim 1, it is characterised in that the shell For clip-like magnetic screen shell (1), including folder (11) and lower folder (12) in shape and structure identical, the upper folder (11) and lower folder (12) Set in specular, the upper folder (11) includes first connecting portion (111) and the first Access Division (112), the lower folder (12) Including second connecting portion (121) and the second Access Division (122), the giant magnetoresistance effect chip (4) and permanent magnet (5) fixed setting On the inwall of first connecting portion (111) or second connecting portion (121)；The first connecting portion (111) and second connecting portion (121) connected between by torsion spring (7), first Access Division (112) and the second Access Division (122) are driven by torsion spring and realized The folding of upper folder and lower folder；The sleeve of the micrometer caliper (6) is from first connecting portion (111) and the first Access Division (112) Transition position passes through or the transition position from second connecting portion (121) and the second Access Division (122) passes through.
- 3. a kind of anti-interference adjustable giant magnetoresistance effect current sensor according to claim 2, it is characterised in that described first The section of Access Division (112) and the second Access Division (122) is triangular in shape, first Access Division (112) and the second Access Division (122) it is in the plastic casing layer (1121) of horizontal positioned " 7 " font, alloy magnetic screen to include section successively from outside to inner side Layer (1122) and high-voltage insulation layer (1123), the high-voltage insulation layer of first Access Division (112) and the second Access Division (122) (1123) inner side is fixedly connected with section elastic connecting contact layer (1124) triangular in shape.
- 4. a kind of anti-interference adjustable giant magnetoresistance effect current sensor according to claim 3, it is characterised in that described first The face of two elastic connecting contact layer on the inside of Access Division (112) and the second Access Division (122) and the contact of electrified wire to be measured For inner concave (113).
- A kind of 5. anti-interference adjustable giant magnetoresistance effect current sensor according to claim 4, it is characterised in that the indent Face (113) includes the first contact surface (1131) and the second contact surface (1132), and when not clamping electrified wire to be measured, described first connects Angle between contacting surface (1131) and the second contact surface (1132) is 100 ° -130 °.
- A kind of 6. anti-interference adjustable giant magnetoresistance effect current sensor according to claim 4, it is characterised in that the indent Face (113) is inner concave arc surface.
- A kind of 7. anti-interference adjustable giant magnetoresistance effect current sensor according to claim 1, it is characterised in that the permanent magnetism The distance between iron (5) and giant magnetoresistance effect chip (4) are 2mm-5mm；The giant magnetoresistance effect chip (4) and insulation barrier The distance between (3) it is 5mm-5cm.
- A kind of 8. anti-interference adjustable giant magnetoresistance effect current sensor according to claim 3, it is characterised in that the plastics The material of outer shell (1121) is acrylonitrile-butadiene-styrene copolymer, and the material of the alloy magnetic masking layer (1122) is Permalloy, the material of the high-voltage insulation layer (1123) are D602-1 epoxy imines glass mica paper tapes, the Elastic Contact The material of layer (1124) is EP rubbers.
- A kind of 9. anti-interference adjustable giant magnetoresistance effect current sensor according to claim 1, it is characterised in that the signal Process circuit includes giant magnetoresistance effect chip power supply voltage conversion circuit, magnifier and voltage follower circuit, described huge The output voltage of magnetoresistance chip power supply voltage conversion circuit is connected to the power pins of giant magnetoresistance effect chip, the instrument Amplifying circuit in-phase input end and inverting input are connected with the positive output end and negative output terminal of giant magnetoresistance effect chip respectively；Institute The output end for stating magnifier is connected with voltage follower circuit, and the voltage follower circuit is connected with oscillograph.
- 10. a kind of anti-interference adjustable giant magnetoresistance effect current sensor according to claim 1, it is characterised in that described huge It is wheatstone bridge configuration that magnetoresistance chip (4) is internal.
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Address after: 523000, No. two, No. 17, Songshan hi tech Industrial Development Zone, Guangdong, Dongguan Patentee after: Guangdong Institute of electronic and information engineering, University of Electronic Science and technology of China Address before: 523000, No. two, No. 17, Songshan hi tech Industrial Development Zone, Guangdong, Dongguan Patentee before: Institute of Electronic and Information Engineering In Dongguan, UESTC |